Pulling device for carded yarn drafting arrangements



Oct. 4, 1966 E. F. HOYLER 3,276,195

PULLING DEVICE FOR GARDED YARN DRAFTING ARRANGEMENTS Filed March 25, 1964 2 Sheets-Sheet l INVENTOR. [ff/v.5 T fir/r2 Han El? Oct. 4, 1966 E. F. HOYLER 3,276,195

PULLING DEVICE FOR CARDED YARN DRAFIING ARRANGEMENTS Filed March 25, 1964 2 Sheets-Sheet 2 INVENTOR.

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United States Patent 3,276,195 PULLIN G DEVICE FOR CARDED YARN DRAFTING ARRANGEMENTS Ernst Fritz Hoyler, Kirchheirn, Teck, Wurttemberg, Germany, assignor to Rieter Machine Works Ltd., Winterthur, Switzerland, a corporation of Switzerland Filed Mar. 25, 1964, Ser. No. 354,676 Claims priority, application Switzerland, Apr. 8, 1963,

,433/ 63 4 Claims. (Cl. 57-51) The present invention relates to a device for periodically pulling carded yarn passing through a drafting arrangement provided with means placed in the drafting field for applying a false twist to the yarn.

Pulling means combined with false twist applying means are known through which the movement of the material to be spun is periodically interrupted. Diversion of the yarn is effected by horns mounted on the twisting element. This conventional pulling device cannot be installed in existing drafting arrangements wherein the yarn moves on a straight line, unless the drafting arrangement and machinery are considerably changed, which is practically impossible.

It is an object of the invention to provide a simple device for periodically pulling carded yarn moving through a drafting arrangement and having a false twist applied thereto which device can be conveniently mounted on an existing drafting arrangement without making any appreciable changes. The pulling device according to the invention includes a stationary yarn guide transversely intersecting the line extending between the nips of two drafting roller pairs which define a drafting field. The stationary yarn guide cooperates with a revolving yarn guide which is adjacent said stationary yarn guide and slightly spaced therefrom in the direction of movement of the yarn and which also transversely intersects the line extending between the nips of the drafting rollers. The yarn guides are :so arranged that the revolving guide temporarily diverts the yarn at each revolution of the revolving yarn guide for producing a pulling effect. The yarn guides are preferably in the form of rods. The rod forming the stationary yarn guide is mounted diametrically on one end of a stationary tubular element which is coaxial of the yarn in the drafting field. The tubular element coaxially rotatably supports an annular element on which the rod forming the revolving yarn guide is mounted diametrically of the annular element. The latter may also support false twist producing means, i.e. needles forming a needle funnel.

The novel features which are considered characteristic of the invention are set forth with particularity in the appended claims. The invention itself, however, and additional objects and advantages thereof will best be understood from the following description of an embodiment thereof when read in connection with the accompanying drawing wherein:

FIG. 1 is a diagrammatic sectional elevation of a drafting arrangement of a carded yarn ring spinning frame.

FIG. 2 is a portion of FIG. 1 on an enlarged scale, particularly showing a false twist element.

FIG. 3 is a large scale plan view of the false twist element shown in FIG. 2 and looking in the direction of the arrow in said figure.

FIGS. 4 to 7 are perspective views of the rods forming part of the false twist element in different operating positions.

Referring more particularly to FIG. 1 of the drawing, numerals 1 and 2 designate two roller pairs defining a drafting field. A stationary tubular element 4 mounted on a frame 3 and rotatably supporting a needle funnel 5 which applies a false twist to a fiber compound 6 3,276,195 Patented Oct. 4, 1966 formed on an annular element or ring 11 to which the needles forming the funnel 5 are connected. The element 11 revolves on an antifriction bearing 12 whose inner race is formed by the element 4 whose axis coincides with the line connecting the nips of the pairs of drafting rollers 1 and 2. A stationary yarn guide in the form of a transverse rod 14 is attached to stationary tubular element 4 and extends diametrically through the bore of the tubular element at one end thereof and is normal to the yarn passing through the element 4. The element 11 does not only support the needles forming the funnel 5 but also supports a yarn guide in the form of a transverse rod 15 extending diametrically with respect to the ring 11 and adjacent the rod 14. The rod 15, however, is slightly spaced from the rod 14 to afford easy passage of the yarn 6 between the rods when the latter are parallel with one another as shown in FIG. 6.

Plucking or pulling of the yarn is effected as follows:

The yarn may be introduced, for example, at the right side of the rod 14, which is stationary, and is in the position I indicated in FIG. 3 while the rods 14 and 15 are parallel. The yarn remains on the right side of the rod 14 in FIG. 3. The rod 15 rotating in the direction of the arrow shown in FIG. 3 pushes the yarn alongside the rod 14 into the position II shown in FIG. 3. This pushing effect discontinues because the force component which is parallel with the stationary rod 14 becomes too small to overcome the frictional resistance when the angle a formed by the rods and shown in FIG. 5 decreases. Therefore, at continued rotation of the rod 15 toward the subsequent parallel position of the rods the yarn 6 assumes the configuration shown in FIG. 6, i.e., the yarn is diverted to the left (position III in FIG. 3) by a distance amounting to about the thickness of the rod 14. Continued rotation of the rod 15 causes movement of the yarn into the position IV shown in FIG. 3 where the yarn is released (FIG. 7) and snaps back into the initial position I to be pushed once more by the rod 15 along the stationary rod 14 for effecting a new pulling action. Since the needle funnel makes about 2000 to 3000 revolutions per minute, the yarn is subjected to an equal number of pulls while passing through the drafting arrangement.

I claim:

1. A pulling device for periodically pulling carded yarn pas-sing through a drafting arrangement, comprismg:

a stationary yarn guide placed in the drafting arrangement transversely to the direction of movement of the yarn and engaging with the yarn, and

a revolving guide placed in the drafting arrangement transversely to the direction of movement of the yarn adjacent said stationary guide and forming a clearance therewith permitting passage of the yarn between said guides, said revolving guide engaging with the yarn for temporarily pushing the yarn alongside said stationary yarn guide and pulling the yarn at each revolution of the revolving yarn guide.

2. A pulling device as defined in claim 1 wherein said yarn guides are in the form of rods placed in parallel planes normal to the travel direction of the yarn, the rod forming the revolving yarn guide rotating around an axis extending through the longitudinal centers of said rods and normal to the said rods.

3. A pulling device according to claim 2 comprising a stationary tubular element placed in the drafting arrangement coaxially of the yarn passing through the 3 4 drafting arrangement, said rod forming the stationary References Cited by the Examiner yarn guide being mounted on said tubular element, and UNITED STATES PA ENTS an annular element coaxially rotatably supported by said 731,883 6/1903 Fredenburgh -77 35 tubular element, said rod forming the revolving yarn 5 FOREIGN PATENTS guide being mounted on said annular element. 1 317 476 1/1963 France 4. A pulling device according to claim 3 comprising 3/1951 Great l'sritaim false twist means mounted on said annular element for 615 223 1/ 1961 I l applying a false twist to the yarn passing through the 10 FRANK] COHEN Primary Examiner.

drafting arrangement I. PETRAKES, Assistant Examiner. 

1. A PULLING DEVICE FOR PERIODICALLY PULLYING CARDED YARN PASSING THROUGH A DRAFTING ARRANGEMENT, COMPRISING: A STATIONARY YARN GUIDE PLACED IN THE DRAFTING ARRANGEMENT TRANSVERSELY TO THE DIRECTION OF MOVEMENT OF THE YARN AND ENGAGING WITH THE YARN, AND A REVOLVING GUIDE PLACED IN THE DRAFTING ARRANGEMENT TRANSVERSELY TO THE DIRECTION OF MOVEMENT OF THE YARN ADJACENT SAID STATIONARY GUIDE AND FORMING A CLEARANCE THEREWITH PERMITTING PASSAGE OF THE YARN BETWEEN SAID GUIDES, SAID REVOLVING GUIDE ENGAGING WITH THE YARN FOR TEMPORARILY PUSHING THE YARN ALONGSIDE SAID STATIONARY YARN GUIDE AND PULLING THE YARN AT EACH REVOLUTION OF THE REVOLVING YARN GUIDE. 